Piston-cooling apparatus



July 13 1926.

W. SCHENKER PISTON coomue APPARATUS Filed Nov. 5, 1921 Patented July 13, 1926.

UNITED STATES 15,592,569 PATENT orrics.

WALTER SCHENKER, OF VJINTERTIIUR, SWITZERLAND, ASSIGNOR TO BUSCH-SULZER BROS-DIESEL ENGINE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

PISTON-COOLING APPARATUS.

Application filed November 5, 1921, Serial No. 513,151, and in Germany December 2, 1920 This invention relates to piston-cooling apparatus having a plurality of separate sets oi telescopic tubes connecting the cooling chamber in the piston with the fixed water connections, each set including means for supplying water, and preferably also means for controlling the water supply.

The single figure in the accompanying drawing, is a diagrammatic sectioi'rillustrating the principle ofthe invention as applied to a single cylinder and suggesting also a suitable multi-cylinder arrangement.

The piston 1, which reciprocates in the ordinary way in the engine cylinder not shown, is provided with an interior cooling chamber 2, which is connected with the water supply by a plurality of separate tele scopic connections each of which includes means for delivering water or cooling fluid to the chamber and for this purpose may follow any of the modes known to the art for telescopically connecting the water supply to the piston cooling chamber. Each telescopic connection is made up as follows: The piston carries a tube 3 screw-throaded thereto and in communication with the cooling chamber. This tube reciprocates with slight clearance in a stationary tube 4 mounted on the drainage box 5, which will be un derstood to be suitably supported as a fixed part of the water supply apparatus. The drainage box has a vent 6 and outlet 7 and is or may be connected to other like drainage boxes as by means of connecting pipes 8 or otherwise. The supply tube 10 passes through the box 5 and into the tubes 3 and 4, so as to deliver a jet to the former tube and the cooling chamber, and the return flow takes place through the space between the tubes 10 and 3 and the drainage box. Each tube 10 is connected to a common water or liquid supply header 9 by a valve 11. I prefer to make each of the several sets of telescopic connections identical, and in the present case each piston chamber is provided with two such identical sets and each set is capable, as just described, of supplying cooling fluid to the cooling chamber and also of conducting it therefrom, although it is not essential that every one of several sets should be capable of return flow. The valves 11 may be individually operated, but preferably the two valves 11 serving the two sets of telescopic connections of each piston are connected together and arranged in the opposite sense, so that when one is open, the other is closed; this is conveniently effected by joining the valve cranks 12 by a connecting rod 13 provided with an operating handle l-l, which latter may be common not only to the valves of a given pistonbut where the invention is applied to a multicylinder engine, to the valves controlling the supply of cooling fluid to the pistons of all thecylinders. This enables the cooling of all the pistons to be controlled in uniformity and from a single station. It will be apparent that by the organization described, one of the sets may serve for the supply of all the water employed in the cooling of the piston, the return flow being through both sets, or where the valves are individually operated, as they may be if the connecting rod 18 is omitted, both sets may serve supply, the return flow being through both of them. This permits a desirable regulation oi the cooling efl'ect to suit the needs of the engine besides providing against interruption of the oooling eii'ect in the event of stop )age or failure of one of the sets. Hereto ore the fail ure of one telescopic connection has resulted in the cessation of the cooling system for the corresponding piston. l urthermore by the described arrangem nt oi connecting rod and handle, the direction of flow through the piston chamber may be reversed or altered, which eliminates the likelihood oi accumulation of sediment from the water or cooling liquid.

1. A piston cooling device comprising a fluid supply apparatus, a piston having therein a cooling chamber, means for supplying cooling fluid to and removing it from said chamber comprisinga plurality of separate connections between said fluid supply apparatus and said chamber, and means for optionally delivering cooling fluid to said chamber through any of said connections.

2. A piston cooling device comprising fluid supply apparatus, a piston having therein a cooling chamber, a plurality of.

separate sets of telescopic connections between said water supply apparatus and said chamb r each set including means for delivering cooling fluid to said chamber, and a control valve for each set.

8. A piston cooling device comprising fluid supply apparatus, a piston having therein a cooling chamber, a plurality of separate sets of telescopic connections between sa-id fluid supply apparatus and said chamber, each set including a supply tube and a drainage tube, and means for altering the flow of the cooling fluid through said connections so that it enters the piston chamber by a set of connections formerly serving only for drainage and leaves by connect-ions formerly serving to supply cooling fluid to the piston chamber.

4 A piston cooling device comprising fluid supply apparatus, a piston having therein a cooling chamber, two separate sets of telescopic connections between said supply apparatus and said chamber, each set including a supply tube and a drainage tube surrounding the same, a valve in each supply tube arranged in the opposite sense to the valve in the other supply tube, and connections between said valves for insuring their simultaneous operation in initiating the delivery flow of the cooling fluid in one of the sets of connections and stopping it in the other and permitting drainage through the other.

5. In a multi-cylinder internal combustion engine, piston cooling devices comprising fluid supply apparatus, each piston having therein a cooling chamber, a plurality of separate sets of telescopic connections between said supply apparatus and each of said chambers, each set including means for delivering cooling fluid to its chamber, valves for controlling each of said means, and means including connections between the valves, for coincidently operating them.

In testimony whereof, I have signed this specification.

VALTER SCHENKER. 

